[MITgcm-support] Re: viscosity questions

[Martin.Losch at awi.de]

Hi, 
thanks for the KPP suggestion. However, I never had any problems with KPP, and this time again, KPP is not the culprit. I 
turned it of (use cAdjFreq=-1) and the problem persists.

Again: 
with temp/saltAdvScheme = 2 and diffK4T/S = 1.e6, I can suppress the noise, but
with temp/saltAdvScheme = 33 and diffK4T/S = 1.e6, there is a lot of noise (also with diffK4T/S smaller or 0), 
staggerTimeStep = .true.. That's what's really puzzling me. I though that the advection scheme 33 (DST3FL) is extremely 
stable and should remove all grid scale noise (in my previous experience it does exactly that). Why not now?

Martin

Martin Losch
Alfred Wegener Institute 
Postfach 120161, 27515 Bremerhaven, Germany; 
Tel./Fax: ++49(0471)4831-1872/1797



----- Original Message -----
From: Dimitris Menemenlis <menemenlis at sbcglobal.net>
Date: Thursday, November 16, 2006 9:09 pm
Subject: Re: [MITgcm-support] Re: viscosity questions

> KPP does have a computational grid-scale mode in T/S, especially 
> visible at 
> Equator, in my experience.  That's why those horizontal 121 filters 
> were added. 
>  The recommended filters are on by default in KPP_OPTIONS.h.  But 
> worth trying 
> with KPP off.  D.
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